Acute oxalate toxicity of sheep associated with slender iceplant (Mesembryanthemum nodiflorum)     

RH JACOB  RL PEET 《Australian veterinary journal》1989,66(3):91-92

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Soft tissue sarcoma in a short‐beaked echidna (Tachyglossus aculeatus)          下载免费PDF全文

RL Robey  C Sangster  M Gabor  SA Lindsay 《Australian veterinary journal》2018,96(9):360-365

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Vaccination issues of concern to practitioners     

Hustead DR  Carpenter T  Sawyer DC  Bain FT  Henry SC  Huxsol DL  Klingborg DJ  McKissick GE  McNutt RL  Niles DE  Short CR 《Journal of the American Veterinary Medical Association》1999,214(7):1000-1002

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Gravity Field over Northern Eurasia and Variations in the Strength of the Upper Mantle   总被引：1，自引：0，他引：1  

Kogan MG  McNutt MK 《Science (New York, N.Y.)》1993,259(5094):473-479

The correlation of long-wavelength gravity anomalies in northern Eurasia with seismic velocity anomalies in the upper mantle reverses in sign between western and eastern Eurasia. The difference between western and eastern Eurasia can be explained by the presence of a low-viscosity zone in the uppermost mantle beneath eastern Eurasia that is absent to the west. The location of the lateral change in viscosity corresponds with the geologic boundary between the older shields and platforms of the Baltics, Russia, and Siberia and the younger, geologically active mountain belts of eastern Asia. This relation provides evidence that differences in the strength of the upper mantle control the locus of intracontinental deformation.  相似文献   

The elemental composition of asteroid 433 eros: results of the NEAR-shoemaker X-ray spectrometer     

Trombka JI  Squyres SW  Bruckner J  Boynton WV  Reedy RC  McCoy TJ  Gorenstein P  Evans LG  Arnold JR  Starr RD  Nittler LR  Murphy ME  Mikheeva I  McNutt RL  McClanahan TP  McCartney E  Goldsten JO  Gold RE  Floyd SR  Clark PE  Burbine TH  Bhangoo JS  Bailey SH  Petaev M 《Science (New York, N.Y.)》2000,289(5487):2101-2105

We report major element composition ratios for regions of the asteroid 433 Eros imaged during two solar flares and quiet sun conditions during the period of May to July 2000. Low aluminum abundances for all regions argue against global differentiation of Eros. Magnesium/silicon, aluminum/silicon, calcium/silicon, and iron/silicon ratios are best interpreted as a relatively primitive, chondritic composition. Marked depletions in sulfur and possible aluminum and calcium depletions, relative to ordinary chondrites, may represent signatures of limited partial melting or impact volatilization.  相似文献   

Isostasy in australia and the evolution of the compensation mechanism   总被引：2，自引：0，他引：2  

McNutt MK  Parker RL 《Science (New York, N.Y.)》1978,199(4330):773-775

A linear transfer function analysis has been applied to gravity and topographic data from Australia to calculate the isostatic response function of Dorman and Lewis. The Australian response function is considerably different from that calculated for the United States. The differences can be explained on the basis of an apparent evolution of the isostatic compensation mechanism in which viscoelastic creep occurs in the lithosphere and relaxes the initial long-wavelength elastic stresses.  相似文献   

Plasma observations near jupiter: initial results from voyager 1     

Bridge HS  Belcher JW  Lazarus AJ  Sullivan JD  McNutt RL  Bagenal F  Scudder JD  Sittler EC  Siscoe GL  Vasyliunas VM  Goertz CK  Yeates CM 《Science (New York, N.Y.)》1979,204(4396):987-991

Extensive measurements of low-energy positive ions and electrons were made throughout the Jupiter encounter of Voyager 1. The bow shock and magneto-pause were crossed several times at distances consistent with variations in the upstream solar wind pressure measured on Voyager 2. During the inbound pass, the number density increased by six orders of magnitude between the innermost magnetopause crossing at approximately 47 Jupiter radii and near closest approach at approximately 5 Jupiter radii; the plasma flow during this period was predominately in the direction of corotation. Marked increases in number density were observed twice per planetary rotation, near the magnetic equator. Jupiterward of the Io plasma torus, a cold, corotating plasma was observed and the energylcharge spectra show well-resolved, heavy-ion peaks at mass-to-charge ratios A/Z* = 8, 16, 32, and 64.  相似文献   

Plasma observations near jupiter: initial results from voyager 2     

Bridge HS  Belcher JW  Lazarus AJ  Sullivan JD  Bagenal F  McNutt RL  Ogilvie KW  Scudder JD  Sittler EC  Vasyliunas VM  Goertz CK 《Science (New York, N.Y.)》1979,206(4421):972-976

The first of at least nine bow shock crossings observed on the inbound pass of Voyager 2 occurred at 98.8 Jupiter radii (R(J)) with final entry into the magnetosphere at 62 R(J). On both the inbound and outbound passes the plasma showed a tendency to move in the direction of corotation, as was observed on the inbound pass of Voyager 1. Positive ion densities and electron intensities observed by Voyager 2 are comparable within a factor of 2 to those seen by Voyager 1 at the same radial distance from Jupiter; the composition of the magnetospheric plasma is again dominated by heavy ions with a ratio of mass density relative to hydrogen of about 100/1. A series of dropouts of plasma intensity near Ganymede may be related to a complex interaction between Ganymede and the magnetospheric plasma. From the planetary spin modulation of the intensity of plasma electrons it is inferred that the plasma sheet is centered at the dipole magnetic equator out to a distance of 40 to 50 R(J) and deviates from it toward the rotational equator at larger distances. The longitudinal excursion of the plasma sheet lags behind the rotating dipole by a phase angle that increases with increasing radial distance.  相似文献   

Oxygen ions observed near Saturn's A ring     

Waite JH  Cravens TE  Ip WH  Kasprzak WT  Luhmann JG  McNutt RL  Niemann HB  Yelle RV  Mueller-Wodarg I  Ledvina SA  Scherer S 《Science (New York, N.Y.)》2005,307(5713):1260-1262

Ions were detected in the vicinity of Saturn's A ring by the Ion and Neutral Mass Spectrometer (INMS) instrument onboard the Cassini Orbiter during the spacecraft's passage over the rings. The INMS saw signatures of molecular and atomic oxygen ions and of protons, thus demonstrating the existence of an ionosphere associated with the A ring. A likely explanation for these ions is photoionization by solar ultraviolet radiation of neutral O2 molecules associated with a tenuous ring atmosphere. INMS neutral measurements made during the ring encounter are dominated by a background signal.  相似文献   

Radioactive elements on Mercury's surface from MESSENGER: implications for the planet's formation and evolution     

Peplowski PN  Evans LG  Hauck SA  McCoy TJ  Boynton WV  Gillis-Davis JJ  Ebel DS  Goldsten JO  Hamara DK  Lawrence DJ  McNutt RL  Nittler LR  Solomon SC  Rhodes EA  Sprague AL  Starr RD  Stockstill-Cahill KR 《Science (New York, N.Y.)》2011,333(6051):1850-1852

The MESSENGER Gamma-Ray Spectrometer measured the average surface abundances of the radioactive elements potassium (K, 1150 ± 220 parts per million), thorium (Th, 220 ± 60 parts per billion), and uranium (U, 90 ± 20 parts per billion) in Mercury's northern hemisphere. The abundance of the moderately volatile element K, relative to Th and U, is inconsistent with physical models for the formation of Mercury requiring extreme heating of the planet or its precursor materials, and supports formation from volatile-containing material comparable to chondritic meteorites. Abundances of K, Th, and U indicate that internal heat production has declined substantially since Mercury's formation, consistent with widespread volcanism shortly after the end of late heavy bombardment 3.8 billion years ago and limited, isolated volcanic activity since.  相似文献